Antibiotic susceptibility and genotypic characterization of Haemophilus influenzae strains isolated from nasopharyngeal specimens from children in day-care centers in eastern France

Talon, D.; Leroy, J.; Dupont, M.J.; Bertrand, Xavier; Mermet, F.; Thouverez, Michelle; Estavoyer, J.M.

doi:10.1046/j.1469-0691.2000.00151.x

Cited by 18 publications

(17 citation statements)

References 42 publications

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“…In general, high carriage rates of S. pneumoniae and H. influenzae were detected in winter and during rainfall, in children under 2 years of age and in children of low socioeconomic status (Talon et al 2000).…”

Section: Discussionmentioning

confidence: 94%

High nasopharyngeal carriage of drug resistant Streptococcus pneumoniae and Haemophilus influenzae in North Indian schoolchildren

Jain

Kumar

Awasthi

2005

Trop Med Int Health

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Summaryobjectives To determine the carriage rate of Streptococcus pneumoniae and Haemophilus influenzae in healthy Indian schoolchildren. The prevalence of antibiotic resistant strains in the community may be used to assess the trends of antibiotic resistance in invasive strains. Prevalence of resistance to various antimicrobial drugs among S. pneumoniae and H. influenzae was estimated.methods Two thousand four hundred subjects, aged 5-10 years, were enrolled from 45 rural and 45 urban schools. A nasopharyngeal swab was collected from each child, after taking informed written consent. Swabs were processed to isolate S. pneumoniae and H. influenzae. All isolates were tested for resistance to chloramphenicol, erythromycin and co-trimoxazole. Streptococcus pneumoniae isolates were also tested against tetracycline and oxacillin while H. influenzae isolates were tested against ampicillin.results Nasopharyngeal carriage of S. pneumoniae and H. influenzae was high in healthy schoolchildren. Stratified analysis showed that nasal carriage of pneumococci in urban children was significantly lower than in rural children [46.8% vs. 53.2%, P < 0.001]. Carriage rates of H. influenzae in male and female populations were significantly different (47.8% vs. 52.3%, P < 0.04). Penicillin resistance in S. pneumoniae was found low (3.3%), but 22.9% of H. influenzae isolates were ampicillin resistant. Resistance to co-trimoxazole was very high in both S. pneumoniae (81.8%) and H. influenzae (67.3%).conclusion There is high nasopharyngeal carriage of drug resistant S. pneumoniae and H. influenzae in schoolchildren of north India. Currently, in India, co-trimoxazole for 5 days is recommended for treatment of non-severe pneumonia and third generation cephalosporins are drug of choice for management of severe pneumococcal/H. influenzae diseases. We found high co-trimoxazole resistance and low penicillin resistance in pneumococcal isolates. This justifies empirical use of penicillin in management of invasive pneumococcal infections in India.

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Section: Discussionmentioning

confidence: 94%

High nasopharyngeal carriage of drug resistant Streptococcus pneumoniae and Haemophilus influenzae in North Indian schoolchildren

Jain

Kumar

Awasthi

2005

Trop Med Int Health

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“…In most cases colonization causes only a carrier state without producing clinical symptoms, but, if a change occurs in the host's condition, the PRP can cause disease (3). In addition, the bacteria that are carried in the upper respiratory tract can spread from person to person (6, 7, 10), which is why their presence can provide useful and important information on the emergence of resistance in clinical isolates (8,11).…”

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confidence: 99%

Nasopharyngeal versus Oropharyngeal Sampling for Isolation of Potential Respiratory Pathogens in Adults

Lieberman

Shleyfer²,

Castel³

et al. 2006

J Clin Microbiol

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The optimal methodology for the identification of colonization by potential respiratory pathogens (PRP) in adults is not well established. The objectives of the present study were to compare the sensitivities of sampling the nasopharynx and the oropharynx for identification of PRP colonization and to compare the sensitivities of samples from the nasopharynx by swab and by washing for the same purpose. The study included 500 participants with a mean age of 65.1 ؎ 17.8 years. Of these, 300 patients were hospitalized for acute febrile lower respiratory tract infection and 200 were controls. Each participant was sampled by oropharyngeal swab (OPS), nasopharyngeal swab (NPS), and nasopharyngeal washing (NPW). The samples were tested by conventional bacteriological methods to identify Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis. OPS detected colonization by S. pneumoniae in 30% of the subjects compared with 89% by NPS and NPW (P < 0.000001). The corresponding rates for H. influenzae were 49% and 64%, respectively (no significant difference [NS]), and for M. catarrhalis were 72% and 46%, respectively (P < 0.0004). NPS identified 61% of the cases of colonization with S. pneumoniae, compared with 76% by NPW (NS). The corresponding rates for H. influenzae were 31% and 56%, respectively (P < 0.04), and for M. catarrhalis were 39% and 33%, respectively (NS). We conclude that the sensitivities of nasopharyngeal and oropharyngeal sampling for identification of PRP colonization in adults are different for each of the three bacteria in this category. The combined results of sampling from both sites are necessary to obtain a true picture of the rate of colonization. NPW is superior to NPS.Colonization of the mucosal membrane of the nasopharynx and the oropharynx by the potential respiratory pathogens (PRP), Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis, has several clinical manifestations. In most cases colonization causes only a carrier state without producing clinical symptoms, but, if a change occurs in the host's condition, the PRP can cause disease (3). In addition, the bacteria that are carried in the upper respiratory tract can spread from person to person (6, 7, 10), which is why their presence can provide useful and important information on the emergence of resistance in clinical isolates (8,11).Age is the most influential factor in the rate of colonization by PRP in healthy individuals. The maximal rates seen in preschool children decline during the school years and decline sharply in adults (5, 6). The high colonization rates in the pediatric age group are the reason that the vast majority of studies on this issue were conducted on this age group, while the number of studies that evaluated PRP colonization in adults is small (3). In these circumstances, it is not surprising that even the basic methodology to test for colonization in adults is not well established. The present study was designed to deal with one of the aspects of this issue.The two technique...

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“…In addition to carriage in the upper respiratory tract, the organism can spread from person to person (16,17,24). Furthermore, studying the organisms carried in the upper respiratory tract provides useful information on the emergence of resistance in clinical isolates (18,27). It is also important to evaluate the mucosal carriage of the organisms in vaccine trials as an index of potential herd protection.…”

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confidence: 99%

Relative Importance of Nasopharyngeal versus Oropharyngeal Sampling for Isolation of Streptococcus pneumoniae and Haemophilus influenzae from Healthy and Sick Individuals Varies with Age

Greenberg¹,

Broides

Blancovich³

et al. 2004

J Clin Microbiol

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Streptococcus pneumoniae and Haemophilus influenzae carriage is a useful index for measuring the emergence of resistance and outcome in vaccination trials. We performed a study to determine which sampling site, nasopharynx (NP) or oropharynx (OP), yields the highest rate of S. pneumoniae and H. influenzae isolation at different ages. Both NP and OP cultures were obtained from 216 children aged <60 months and their mothers. The total S. pneumoniae carriage rate was 68% among children and 15% among mothers (P < 0.001). Using NP alone for the isolation of S. pneumoniae would have missed 2, 2, and 42% and using OP alone would have missed 77, 66, and 45% of S. pneumoniae in children aged 0 to 23 months, 24 to 59 months, and mothers, respectively. Using NP cultures alone for H. influenzae would have missed 23, 24, and 81% of the isolates, respectively. The respective figures for H. influenzae isolation from OP alone are 38, 29, and 9%. In children, S. pneumoniae was carried mainly in the NP while H. influenzae was equally carried in the NP and OP. In mothers, S. pneumoniae was carried equally in the NP and OP while H. influenzae was carried significantly more often in the OP. In children, H. influenzae colonization increased during illness, mainly in the NP. Culturing only one site significantly reduced the recovery of H. influenzae at all ages. NP cultures for S. pneumoniae detected close to 100% of isolates in children but only 58% of isolates in mothers.Streptococcus pneumoniae and Haemophilus influenzae are important bacterial pathogens causing infections in young children and in elderly patients (1,22,23). Both organisms commonly colonize the mucosal membrane of the nasopharynx and throat of healthy children, and most children are colonized at some point during the first 2 years of life (10, 15). Information on the nasopharyngeal (NP) and oropharyngeal (OP) carriage rate of both organisms is crucial to understanding disease epidemiology, since these organisms can spread from colonized sites to adjacent mucosal tissues to cause mucosal infections or, in the case of S. pneumoniae, invade the bloodstream to cause bacteremia and meningitis. In addition to carriage in the upper respiratory tract, the organism can spread from person to person (16,17,24). Furthermore, studying the organisms carried in the upper respiratory tract provides useful information on the emergence of resistance in clinical isolates (18,27). It is also important to evaluate the mucosal carriage of the organisms in vaccine trials as an index of potential herd protection.Nasopharyngeal sampling is considered superior to OP sampling for detecting S. pneumoniae, especially in young children (25), but there are other contradictory results showing that in adults OP sampling yields higher isolation rates (4, 16). Only a few carriage studies have directly compared different sampling methods for the detection of S. pneumoniae and H. influenzae (4, 6, 25; R. Dagan, O. Zamir, M. Sikuler-Cohen, P. Yagupsky, P. Peeters, and M. Hohenboken, Abstr. 41st Intersc...

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Antibiotic susceptibility and genotypic characterization of Haemophilus influenzae strains isolated from nasopharyngeal specimens from children in day-care centers in eastern France

Abstract: Resistance due to beta-lactamase production has disseminated in some day-care centers, mostly by person-to-person spread but also via the possible conjugal transfer of large plasmids between strains. The size of day-care centers may affect the risk of transmission.

Cited by 18 publications

References 42 publications

High nasopharyngeal carriage of drug resistant Streptococcus pneumoniae and Haemophilus influenzae in North Indian schoolchildren

High nasopharyngeal carriage of drug resistant Streptococcus pneumoniae and Haemophilus influenzae in North Indian schoolchildren

Nasopharyngeal versus Oropharyngeal Sampling for Isolation of Potential Respiratory Pathogens in Adults

Relative Importance of Nasopharyngeal versus Oropharyngeal Sampling for Isolation of Streptococcus pneumoniae and Haemophilus influenzae from Healthy and Sick Individuals Varies with Age

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